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Evaluate : (i) sum(n=1)^(10)(2+3^(n))"...

Evaluate :
(i) `sum_(n=1)^(10)(2+3^(n))" "`(ii) `sum_(k=1)^(n)[2^(k)+3^((k-1))]" "`(iii) `sum_(n=1)^(8) 5^(n)`

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